This is a list of the 100 most populous of the 3,144 counties in the United States based on the national decennial US census conducted on April 1, 2020, and vintage Census population estimates for July 1, 2025.

Many of the counties on the list include major cities or metropolitan areas in all parts of the United States. Seven of the listed counties have consolidated city and county government, namely the City and County of Honolulu, Metropolitan Government of Nashville and Davidson County, Tennessee, City and County of Philadelphia, City and County of San Francisco, City of Jacksonville and Duval County, Indianapolis and Marion County, and City and County of Denver. Kings County, Queens County, New York County, Bronx County, and Richmond County are coterminous with the respective boroughs of New York City; they fall under the jurisdiction of the combined Government of New York City. Independent cities are not counted.

Many of the most populous counties listed are in Southern California, Texas, and New York, and roughly correspond to several of the most populous cities or municipalities in the United States. Counties in the Western United States are typically larger by area and therefore often have higher absolute populations even with comparable population densities.

List This list includes the most populous US counties sorted according to both the 2020 official enumeration and 2025 vintage population estimates by the United States Census Bureau (USCB).

RankCountyState Land areaApril 1,2020censusJuly 1,2025estimates Mid-2020 tomid-2025 change County seat km2GeoHive - the United States of America - US States and Counties (attached Excel spreadsheet)mi2The area in square kilometers of the column to the left divided by 2.589988110336 (1.6093442).absolute%1Los Angeles California 10,509.874,057.8810,014,0099,694,934−319,075−3.2Los Angeles2CookIllinois2,448.38945.335,275,5415,194,625−80,916−1.5Chicago3HarrisTexas4,411.991,703.484,731,1455,045,026313,8816.6Houston4MaricopaArizona23,828.269,200.144,420,5684,689,558268,9906.1Phoenix5San DiegoCalifornia10,895.124,206.633,298,6343,282,248−16,386−0.5San Diego6OrangeCalifornia2,047.56790.573,186,9893,149,507−37,482−1.2Santa Ana7Miami-DadeFlorida4,915.061,897.722,701,7672,802,029100,2623.7Miami8DallasTexas2,256.60871.282,613,5392,661,39747,8581.8Dallas9KingsNew York183.4170.822,736,0742,653,963−82,111−3.0Brooklyn, NYC10RiversideCalifornia18,664.707,206.482,418,1852,544,916126,7315.2Riverside11ClarkNevada20,438.717,891.432,265,4612,407,226141,7656.3Las Vegas12QueensNew York281.10108.532,405,4642,358,182−47,282−2.0 Queens, NYC13KingWashington5,479.292,115.572,269,6752,344,93975,2643.3Seattle14TarrantTexas2,236.74863.612,110,6402,248,466137,8266.5Fort Worth15San BernardinoCalifornia51,947.2320,056.942,181,6542,224,09142,4371.9San Bernardino16Bexar Texas3,211.121,239.822,009,3242,160,088150,7647.5San Antonio17BrowardFlorida3,133.331,209.791,944,3752,013,31768,9423.5Fort Lauderdale18Santa ClaraCalifornia3,341.341,290.101,936,2591,914,391−21,868−1.1San Jose19WayneMichigan1,585.28612.081,793,5611,769,038−24,523−1.4Detroit20MiddlesexMassachusetts2,118.14817.821,632,0021,669,97937,9772.3Lowell and Cambridge21New YorkNew York59.1322.831,694,2511,664,862−29,389−1.7Manhattan, NYC22AlamedaCalifornia1,914.05739.021,682,3531,636,630−45,723−2.7Oakland23SacramentoCalifornia2,498.42964.641,584,1691,618,46034,2912.2Sacramento24Palm BeachFlorida5,100.001,970.001,492,1911,575,72683,5355.6West Palm Beach25PhiladelphiaPennsylvania347.32134.101,603,7971,574,281−29,516−1.8Philadelphia26HillsboroughFlorida2,642.341,020.211,459,7621,574,115114,3537.8Tampa27SuffolkNew York2,362.20912.051,525,9201,546,09020,1701.3Riverhead28OrangeFlorida2,339.87903.431,429,9081,528,00298,0946.9Orlando29Bronx New York109.0342.101,472,6541,406,332−66,322−4.5Bronx, NYC30NassauNew York737.41284.721,395,7741,398,9393,1650.2Mineola31TravisTexas2,564.61990.201,290,1881,389,67099,4827.7Austin32FranklinOhio1,378.36532.191,323,8071,361,53637,7292.9Columbus33CollinTexas2,178.76841.221,064,4651,297,179232,71421.9McKinney34OaklandMichigan2,247.24867.661,274,3951,288,33713,9421.1Pontiac35HennepinMinnesota1,433.79553.591,281,5651,284,7843,2190.3Minneapolis36WakeNorth Carolina2,163.21835.221,129,4101,257,235127,82511.3Raleigh37MecklenburgNorth Carolina1,356.75523.841,115,4821,233,383117,90110.6Charlotte38CuyahogaOhio1,184.12457.191,264,8171,232,925−31,892−2.5Cleveland39AlleghenyPennsylvania1,890.88730.071,250,5781,225,035−25,543−2.0Pittsburgh40Salt LakeUtah1,922.50742.281,185,2381,220,91635,6783.0Salt Lake City41Contra CostaCalifornia1,854.27715.941,165,9271,170,0704,1430.4Martinez42FairfaxVirginia1,012.60390.971,150,3091,167,87317,5641.5Fairfax43FultonGeorgia1,363.98526.631,066,7101,098,79132,0813.0Atlanta44PimaArizona23,794.319,187.041,043,4331,074,68531,2523.0Tucson45MontgomeryMaryland1,272.34491.251,062,0611,074,58212,5211.2Rockville46Denton Texas2,275.13878.43906,4221,069,346162,92418.0Denton47DuvalFlorida1,974.07762.19995,5671,062,96367,3966.8Jacksonville48FresnoCalifornia15,431.135,957.991,008,6541,035,45626,8022.7Fresno49GwinnettGeorgia1,114.69430.38957,0621,018,09961,0376.4Lawrenceville50WestchesterNew York1,114.98430.501,004,4571,015,74311,2861.1White Plains51CapitolConnecticut2,660.801,027.34976,248994,11517,8671.8Hartford52MarionIndiana1,026.41396.30977,203992,19614,9931.5Indianapolis53St. LouisMissouri1,315.20507.801,004,125990,911−13,214−1.3Clayton54HonoluluHawaii1,555.92600.741,016,508988,703−27,805−2.7Honolulu55BergenNew Jersey603.49233.01955,732977,02621,2942.2Hackensack56Fort Bend Texas2,292885822,779975,191152,41218.5Richmond57Prince George'sMaryland1,250.16482.69967,201970,3743,1730.3Upper Marlboro58PinellasFlorida709.14273.80959,107948,563−10,544−1.1Clearwater59ErieNew York2,700.561,042.69954,236946,741−7,495−0.8Buffalo60PierceWashington4,324.011,669.51921,130946,28825,1582.7Tacoma61DuPageIllinois848.22327.50932,877934,2981,4210.2Wheaton62KernCalifornia21,061.578,131.92909,235927,06817,8332.0Bakersfield63MilwaukeeWisconsin625.23241.40939,489924,216−15,273−1.6Milwaukee64HidalgoTexas4,068.521,570.87870,781921,54950,7685.8Edinburg65ShelbyTennessee1,976.61763.17929,744910,226−19,518−2.1Memphis66Essex New Jersey326.89126.21863,728896,37932,6513.8Newark67WorcesterMassachusetts3,912.881,510.77862,111888,50226,3913.1Worcester68MacombMichigan1,241.18479.22881,217886,2215,0040.6Mount Clemens69Middlesex New Jersey800.08308.91863,162883,33520,1732.3New Brunswick70El Paso Texas2,622.861,012.69865,657877,85812,2011.4El Paso71MontgomeryPennsylvania1,251.07483.04856,553877,64321,0902.5Norristown72LeeFlorida2,031.88784.51760,822875,607114,78515.1Fort Myers73PolkFlorida4,6601,798725,046874,790149,74420.7Bartow74SnohomishWashington5,406.012,087.27827,957870,65642,6995.2Everett75BaltimoreMaryland1,549.59598.30854,535847,650−6,885−0.8Towson76HamiltonOhio1,051.30405.91830,639838,4187,7790.9Cincinnati77VenturaCalifornia4,773.691,843.13843,843830,851−12,992−1.5Ventura78EssexMassachusetts1,275.73492.56809,829826,65316,8242.1Salem and Lawrence79San FranciscoCalifornia121.4046.87873,965826,079−47,886−5.5San Francisco80San JoaquinCalifornia3,603.511,391.32779,233823,81544,5825.7Stockton81OklahomaOklahoma1,835.83708.82796,292822,12525,8333.2Oklahoma City82MultnomahOregon1,117.05431.30815,428795,391−20,037−2.5Portland83JeffersonKentucky985.27380.42782,969795,22212,2531.6Louisville84CobbGeorgia879.43339.55766,149793,34527,1963.5Marietta85Suffolk Massachusetts150.6258.15797,936791,891−6,045−0.8Boston86MontgomeryTexas2,699.231,042.18620,443781,194160,75125.9Conroe87DeKalbGeorgia693.03267.58764,382774,39410,0121.3Decatur88Utah Utah5,188.912,003.45659,399759,859100,46015.2Provo89El PasoColorado5,508.392,126.80730,395757,04026,6453.6Colorado Springs90WilliamsonTexas2,889.991,115.83609,017752,827143,81023.6Georgetown91MonroeNew York1,702.15657.21759,443750,506−8,937−1.2Rochester92DavidsonTennessee1,305.44504.03715,884745,90430,0204.2Nashville93San MateoCalifornia1,161.37448.41764,442743,568−20,874−2.7Redwood City94DenverColorado401.36154.97715,522740,61325,0913.5Denver95NorfolkMassachusetts1,025.91396.11725,981739,74913,7681.9Dedham96HudsonNew Jersey119.6346.19724,854735,03310,1791.4Jersey City97JacksonMissouri1,565.55604.46717,204732,99415,7902.2Independence and Kansas City98LakeIllinois1,149.10443.67714,342719,3394,9970.7Waukegan99WillIllinois2,167.58836.91696,355712,25315,8982.3Joliet100TulsaOklahoma1,476.94570.25669,279698,78229,5034.4Tulsa

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